configure: Fix compiler sysroot detection

jhe2 / gmu

The Gmu Music Player

GNU General Public License v2.0

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Closed pcercuei closed 2 years ago

pcercuei commented 2 years ago

If the compiler has a -print-sysroot option, use this as the base directory.

Fixes libopus detection on OpenDingux.

Signed-off-by: Paul Cercueil paul@crapouillou.net